package reflection;

import java.lang.annotation.Annotation;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
import static java.lang.System.out;

public class ClassModifierAndType {
  public static void main(String... args) {
    try{
      Class<?> c = Class.forName(args[0]);
      out.format("Class:%n  %s%n%n", c.getCanonicalName());
      out.format("Modifiers:%n  %s%n%n", Modifier.toString(c.getModifiers()));

      out.format("Type Parameters:%n");
      TypeVariable[] tv = c.getTypeParameters();
      if(tv.length != 0){
        out.format("  ");
        for (TypeVariable t : tv)
          out.format("%s ", t.getName());
        out.format("%n%n");
      }
      else{
        out.format("  -- No Type Parameters --%n%n");
      }

      out.format("Implemented Interfaces:%n");
      Type[] intfs = c.getGenericInterfaces();
      if(intfs.length != 0){
        for (Type intf : intfs)
          out.format("  %s%n", intf.toString());
        out.format("%n");
      }
      else{
        out.format("  -- No Implemented Interfaces --%n%n");
      }

      out.format("Inheritance Path:%n");
      List<Class> l = new ArrayList<Class>();
      printAncestor(c, l);
      if(l.size() != 0){
        for (Class<?> cl : l)
          out.format("  %s%n", cl.getCanonicalName());
        out.format("%n");
      }
      else{
        out.format("  -- No Super Classes --%n%n");
      }

      out.format("Annotations:%n");
      Annotation[] ann = c.getAnnotations();
      if(ann.length != 0){
        for (Annotation a : ann)
          out.format("  %s%n", a.toString());
        out.format("%n");
      }
      else{
        out.format("  -- No Annotations --%n%n");
      }

      // production code should handle this exception more gracefully
    }
    catch (ClassNotFoundException x){
      x.printStackTrace();
    }
  }

  private static void printAncestor(Class<?> c, List<Class> l) {
    Class<?> ancestor = c.getSuperclass();
    if(ancestor != null){
      l.add(ancestor);
      printAncestor(ancestor, l);
    }
  }
}
